Back for a second go-round as UMass football coach, Mark Whipple treated yesterday’s national Letter of Intent Day like an old friend. “It was fun. I did a little (recruiting) at Miami, but I like helping kids and meeting people,” Whipple said after inking 15 prospective freshmen as well as three post-graduate transfers. “I reconnected with a lot of familiar faces. It was good seeing people and our staff did a really good job.” Two local products dot the list of UMass newcomers: safety Jarell Addo, who played for former UMass quarterback Dave Palazzi at Leominster High, and 6-foot-6 lineman Dan DiNicola of Walpole, a two-way player at The Dexter School. But the real impact players project to be transfers Blake Frohnapfel, a 6-6 quarterback from Marshall, Penn State wide receiver Alex Kenney, a potential game-breaker with bona fide track speed, and 6-6 Dean College offensive lineman Liam Porter of Natick, who played nine games at Boston College as a redshirt freshman. “Frohnapfel was caught in a numbers game at Marshall but he brings three years experience at the college level and can compete right away,” Whipple said. “Kenney brings speed and was the fastest kid on Penn State, and Porter, we’ll need him there on the line.’’ Whipple, who employs a spread offense, knows he must replace graduated tight end and captain Rob Blanchflower. To that extent, 6-5 Jon Denton from Perry, Kan., and 6-7 Jean Sifrin from Miami should make immediate impacts. Despite the time contraints on the recruiting trail, Whipple felt the program accomplished a great deal. “I think UMass sells itself,” he said. “Our guys are like ambassadors. They did a really good job.” The University of New Hampshire signed 13 players including four Bay Staters. They are 6-5 wide receiver/defensive back Rory Donovan of Canton and Cardinal Spellman High, 6-foot safety D’Andre Drummond of Lawrence and Central Catholic, wide receiver Neil O’Connor of Leominster, and WR/DB Kieran Presley of Amherst and Loomis-Chaffee Prep. “Donovan is just a terrific athlete with a great upside. He can go up and get the football,” UNH coach Sean McDonnell said. “Drummond is a great two-way player. I was impressed with his cover skills. O’Connor is just a winner through and through. . . . Presley was under the radar a lot. He really developed as a football player (last year). He has great ball skills and we’ll probably use him at the slot position.”